Efficiency evaluation method for electric drive system of electric vehicle
An evaluation method and system efficiency technology, applied in the field of automobiles, can solve the problem of single evaluation index of electric drive system
Pending Publication Date: 2022-04-12
FAW CAR CO LTD
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[0004] The invention provides a method for evaluating the efficiency of an electric drive system of an electric vehicle. The evaluation method divides the electric drive efficiency MAP into different regions, and at the same time considers the speed range corresponding to the highest vehicle speed of CLTC, the torque range, and the speed range corresponding to the user's usual working conditions and torque range, comprehensively evaluate the efficiency of the electric drive system, solve the problem of single evaluation index of the electric drive system in the early stage of the project, effectively guide the development and selection of the electric drive system, and provide a basis for the high-quality development of the cruising range and power consumption of the model effective support
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[0072] Taking a certain type of electric drive matched to a certain model as an example, the relevant models and the parameters required for calculation are as follows:
[0073] Model parameters specific value Parameters required for efficiency evaluation specific value M 1466kg n CLTC
902rpm f 6.5‰ T CLTC
911Nm Cd 0.29 n 40
316rpm A 2.62 T 40
772Nm r 0.335 n 80
633rpm - - T 80
830Nm
[0074] The data of the electric drive efficiency test bench takes the speed of the electric drive assembly corresponding to the vehicle speed of 5km / h as a speed interval, and takes 50Nm as the torque interval to obtain the efficiency of the electric drive assembly. According to the above-mentioned electric drive efficiency evaluation area division rules, the pre-matching The data of the two electric drive assemblies are as follows:
[0075]
[0076]
[0077] Conclusion: The overall efficiency of electr...
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The invention relates to an efficiency evaluation method for an electric drive system of an electric vehicle. Comprising the following steps: 1, carrying out a bench test on the electric vehicle electric drive system to obtain a driving efficiency value and a recovery efficiency value of the electric vehicle electric drive system in a driving mode and a braking mode; 2, making a driving efficiency value and a recovery efficiency value of the electric driving system of the electric vehicle tested in the step 1 into an MAP, and carrying out regional division on the MAP; 3, calculating the average efficiency of the areas divided in the step 2, and calculating the proportions of different areas; and 4, comparing the average efficiency values of different regions and the region ratio, calculating the comprehensive efficiency of the electric drive system, and evaluating the quality of the electric drive system. The electric drive efficiency MAP is divided into different areas, the rotating speed interval and the torque interval corresponding to the maximum speed of the CLTC and the rotating speed interval and the torque interval corresponding to the common working condition of the user are considered, and the efficiency of the electric drive system is comprehensively evaluated.
Description
technical field [0001] The invention belongs to the technical field of automobiles, in particular to a method for evaluating the efficiency of an electric drive system of an electric vehicle. Background technique [0002] With the further tightening of energy conservation and emission reduction, electric vehicles have gradually become the future development trend of the automobile industry due to their green and energy-saving features. [0003] For electric vehicles, the efficiency of the electric drive system has a greater impact on the battery life and energy consumption of the vehicle. At present, there are many evaluation indicators for electric drive efficiency in the industry, and the methods are different. Generally, the highest efficiency is used as the evaluation basis, but the highest efficiency area is often not used in the actual development process, which makes the electric drive evaluation one-sided. In the later stage of vehicle model development, the efficie...
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IPC IPC(8): G01R31/00G01M17/007
Inventor 张丽雪金宗庆逯家鹏高金威王海春史耀东杨雪峰余传文张海军
Owner FAW CAR CO LTD